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Finding the Fourth Proportional to 520.25, 717.99 and 287.42

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Solution

The fourth proportional to 520.25, 717.99 and 287.42 is: 396.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.25 : 717.99 = 287.42 : x
  2. Step 2: Convert to fraction form
    520.25/717.99 = 287.42/x
  3. Step 3: Cross multiply
    520.25x = 717.99 × 287.42
  4. Step 4: Simplify right side
    520.25x = 206,364.69
  5. Step 5: Solve for x
    x = 206,364.69/520.25
  6. Step 6: Final answer
    x = 396.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.